[填空题]
Deuterium makes up 0.0115% of natural x3u0zf* ,mmfe; eun1t hydrogen on/3sy d0nc vvaoqk .u++ average. Make a rough estimate of the total deuterium in the Earth's oceans and estimate the to0qvv+3 .cus+ onkda /ytal energy released if all of it were used in fusion reactors.
The total mass of deuterium is about $ \times 10^{16}\ \text{kg}$
The total energy is about $\times 10^{30}\ \text{J}$